regex - Extracting phone number issue in R -


having numbers this: 

ll <- readlines(textconnection("(412) 573-7777 opt 1 563.785.1655 x1797 (567) 523-1534 x7753 (567) 483-2119 x 477 (451) 897-mall (342) 668-6255 ext 7 (317) 737-3377 opt 4 (239) 572-8878 x 3 233.785.1655 x1776 (138) 761-6877 x 4 (411) 446-6626 x 14 (412) 337-3332x19 412.393.3177 x24 327.961.1757 ext.4"))

what regex should write get: 

xxx-xxx-xxxx

i tried one: 

gsub('[(]([0-9]{3})[)] ([0-9]{3})[-]([0-9]{4}).*','\\1-\\2-\\3',ll)

it doesn't cover possibilities. think can using several regex patterns, think can done using single regex.

if want extract numbers represented letters, can use following regex in gsub:

gsub('[(]?([0-9]{3})[)]?[. -]([a-z0-9]{3})[. -]([a-z0-9]{4}).*','\\1-\\2-\\3',ll)

see ideone demo

you can remove a-z character classes match numbers no letters.

regex:

  • [(]? - optional (
  • ([0-9]{3}) - 3 digits
  • [)]? - optional )
  • [. -] - either dot, or space, or hyphen
  • ([a-z0-9]{3}) - 3 digit or letter sequence
  • [. -] - either dot, or space, or hyphen
  • ([a-z0-9]{4}) - 4 digit or letter sequence
  • .* - number of characters end

-

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